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That looks similar to the 529 scope that was very popular in TV stations for decades. The shifting is caused by an unbalanced voltage condition on the plates of the horizontal amplifiers.
I would check your horizontal mag control (switch & pot) as dirty contacts will produce that effect. The mag circuit is in the cathodes of the output tubes.
The vertical amplifiers gives trouble too. If you notice the trace shifting and compressing vertically or running out of gain, the tubes should be replaced. There is a retrofit that replaces the output tubes with transistors. Was published in Broadcast Engineering magazine back in the seventies. You can probably find the mod online.
Good luck.
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